Human-Scale CHIMP Robot Has Four Limbs, But Moves Like a TankMarch 12, 2013. A team from Carnegie Mellon University’s National Robotics Engineering Center is building a new class of robot to compete in the Defense Advanced Research Projects Agency’s (DARPA) Robotics Challenge — a human-size robot that moves, not by walking, but on rubberized tracks on the extremities of each of its four limbs. Though the appearance of the CMU Highly Intelligent Mobile Platform, or CHIMP, is vaguely simian, its normal mode of locomotion will be much like that of a tank, with the tracks of all four limbs on the ground.